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x in (-oo:+oo)
x/13 = 7/3 // - 7/3
x/13-(7/3) = 0
x/13-7/3 = 0
1/13*x-7/3 = 0 // + 7/3
1/13*x = 7/3 // : 1/13
x = 7/3/1/13
x = 91/3
x = 91/3
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